Search & Filtering
how much time will it take for a ball to reach its maximum height it it was given initial speed of 120ft/s and its angle of inclination is 32 degrees?
an object weighing 40 N rests on an inclined plane making an angle of 30 degree with the horizontal. Resolve the force into components parallel to the plane and perpendicular to the plane
Peter noticed a bug crawling along a meter stick and decided to record the bug's position in five-second intervals. After the bug crawled off the meter stick, Peter created the table shown. What is the displacement of the bug between t = 0.00 s and t = 20.0 s?
Find the magnitude of D=7i-3j-2k,, E=4i+5j-3k
- A dim but resourceful student has a summer job in a factory moving boxes. The 50 kg student finds that if he runs at a speed of 5.8 m/s and then dives head first into the boxes, he can move them across the floor. If the boxes have a mass of 65 kg and the force of friction between the boxes and the floor is 382 N, how far will he move the boxes after hitting it six times?
1) Crazy stuntwoman, Ima Nutts, is performing a stunt for an upcoming summer movie thriller. In the stunt, she has to jump off the top of a very high apartment building and land in a crash mat below. At a point during the fall, when she is still 70.0 m above the crash mat, she is falling at a speed of 31 m/s. Her mass is 75 kg.
a) What is her gravitational potential energy at this point?
B) What is her kinetic energy at this point?
c) How much total energy does she have at this point?
d) How high is the apartment building?
e) What will her velocity be when she hits the crash mat?
1) A 5 kg watermelon is placed on the edge of a balcony 43.0 m high.
a) What is the watermelon's gravitational potential energy?
b) If all of the gravitational potential energy is converted into kinetic energy after the box is pushed off the balcony, how fast will the watermelon be moving when it hits the ground?
1) A 6.5 kg ball is launched upwards from the ground with a speed of 21 m/s.
a) How much kinetic energy does the ball have?
b) If all of the ball's kinetic energy is converted to gravitational potential energy, how high will the ball go?
Problem 4.
A cannon has a muzzle speed of 550 feet per second. A shot is fired from
ground level at an angle of 20◦ and overshoots the target by 50 feet. At what
angle should the next shot be fired to hit the target (same muzzle speed)?
Neglect air resistance. Give numerical answers accurate to two decimal places.
Two very large cruise ships each have a mass of 415 000 tonnes. If they were docked side by side, 1.0 m apart, their centres would be 60 m apart. What is the force of gravitational attraction putting them together? (Hint: 1 tonne = 1000 kg)
